.w{
    width: 90%;
    margin: 10px auto;
}
.titli {
    h3 {
        font-size: 17px;
        color: #000000;
        text-align: center;
        font-weight: 400;
    }
    .icon {
        position: absolute; /* 将 icon 脱离文档流 */
        left: 10px;
        font-size: 25px;
        color: #000000;
    }
    position: relative; /* 父容器设置为相对定位 */
    display: flex;
    align-items: center; /* 垂直居中 */
    justify-content: center; /* 水平居中 */
    width: 100%;
    height: 8vh;
    background: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
}